add more type

packages/cts-api/src/protocol/MediaMsg.ts

 import { MsgBase, MsgType } from './MsgBase';
 
 export class MediaMsg extends MsgBase {
-  type: MsgType = 'media';
+  msgType: MsgType = 'audio';
 
   // 消息内容
   file: { data: Blob | null; url: string };

packages/cts-api/src/protocol/MsgBase.ts

 import { uuid } from '../utils/uuid';
 
-export type MsgType = 'text' | 'media' | 'cmd' | 'attachment';
+export type MsgType = 'text' | 'audio' | 'video' | 'cmd' | 'attachment';
 
 export type ChatType = 'chat' | 'room' | 'group' | 'push';